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Grade 9 Chemistry Test
Test Description: For students currently enrolled in SNC1D at OTHS!
Instructions: Answer all questions to get your test result.
1) Which of the following is the best description of the model of the atom.
A
a central nucleus with orbiting electrons.
B
a mass of positive charge with negative electrons stuck throughout it.
C
Material with positive and negative charges on its surface.
D
A positive nucleus with negative electrons in energy levels.
2) What particles make up the atomic nucleus?
A
protons and neutrons
B
protons
C
neutrons
D
electrons
3) Which statement about the relative number of subatomic particles in an atom is always true?
A
The number of electrons equals the number of neutrons in a neutral atom.
B
The mass number is equal to the total number of protons and electrons.
C
The atomic number is equal to the number of protons
D
The number of neutrons is equal to the mass number of an atom.
4) In which part of an atom is most of the mass located?
A
the protons
B
the energy levels surrounding the nucleus
C
the electrons
D
the nucleus
5) What is the mass number of an atom with 6 protons and 7 neutrons.
A
7
B
6
C
13
D
0.86 amu
6) Which of the following symbols represents the element with an atomic number of 14?
A
N
B
Ni
C
C
D
Si
7) How many electrons does an atom have if the mass number is 15 and the number of neutrons is 7?
A
22
B
15
C
7
D
8
8) Which statement about elements and their relationship in the periodic table is true?
A
Boron and silicon are in the same period
B
Calcium and magnesium are alkaline-earth metals
C
Potassium and phosphorus are in the same group
D
Chlorine and iodine are alkali metals
9) Who discovered that neutrons were part of the atom?
A
Dalton
B
Bohr
C
Chadwick
D
Rutherford
10) Who discovered that electrons were part of the atom?
A
Mendeleev
B
Democritus
C
Faraday
D
Dalton
*select an answer for all questions
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